<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>运算器</title>
    <script src="js/1.js">
    </script>
</head>

<body onload="f2()">
<input type="button" value="输入" id="id1" onclick="f1()" >
<input type="button" value="b1" id="id2" onclick="f2()">
</body>
</html>